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  <title>Retrieves a file from the FTP server and writes it to an open file (non-blocking)</title>

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</div><hr /><div id="function.ftp-nb-fget" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">ftp_nb_fget</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.3.0, PHP 5)</p><p class="refpurpose"><span class="refname">ftp_nb_fget</span> &mdash; <span class="dc-title">Retrieves a file from the FTP server and writes it to an open file (non-blocking)</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.ftp-nb-fget-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">int</span> <span class="methodname"><strong>ftp_nb_fget</strong></span>
    ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$ftp_stream</code></span>
   , <span class="methodparam"><span class="type">resource</span> <code class="parameter">$handle</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$remote_file</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$mode</code></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$resumepos</code><span class="initializer"> = 0</span></span>
  ] )</div>

  <p class="para rdfs-comment">
   <span class="function"><strong>ftp_nb_fget()</strong></span> retrieves a remote file from the FTP 
   server.
  </p>
  <p class="para">
   The difference between this function and <span class="function"><a href="function.ftp-fget.html" class="function">ftp_fget()</a></span> is 
   that this function retrieves the file asynchronously, so your program can 
   perform other operations while the file is being downloaded.
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.ftp-nb-fget-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">ftp_stream</code></em></dt>

     <dd>

      <p class="para">
       The link identifier of the FTP connection.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">handle</code></em></dt>

     <dd>

      <p class="para">
       An open file pointer in which we store the data.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">remote_file</code></em></dt>

     <dd>

      <p class="para">
       The remote file path.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">mode</code></em></dt>

     <dd>

      <p class="para">
       The transfer mode. Must be either <strong><code>FTP_ASCII</code></strong> or
       <strong><code>FTP_BINARY</code></strong>.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">resumepos</code></em></dt>

     <dd>

      <p class="para">The position in the remote file to start downloading from.</p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.ftp-nb-fget-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns <strong><code>FTP_FAILED</code></strong> or <strong><code>FTP_FINISHED</code></strong>
   or <strong><code>FTP_MOREDATA</code></strong>.
  </p>
 </div>

 <div class="refsect1 examples" id="refsect1-function.ftp-nb-fget-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4197">
    <p><strong>Example #1 <span class="function"><strong>ftp_nb_fget()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br /></span><span style="color: #FF8000">//&nbsp;open&nbsp;some&nbsp;file&nbsp;for&nbsp;reading<br /></span><span style="color: #0000BB">$file&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'index.php'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$fp&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'w'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$conn_id&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">ftp_connect</span><span style="color: #007700">(</span><span style="color: #0000BB">$ftp_server</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$login_result&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">ftp_login</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn_id</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$ftp_user_name</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$ftp_user_pass</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;Initate&nbsp;the&nbsp;download<br /></span><span style="color: #0000BB">$ret&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">ftp_nb_fget</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn_id</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$fp</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$file</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">FTP_BINARY</span><span style="color: #007700">);<br />while&nbsp;(</span><span style="color: #0000BB">$ret&nbsp;</span><span style="color: #007700">==&nbsp;</span><span style="color: #0000BB">FTP_MOREDATA</span><span style="color: #007700">)&nbsp;{<br /><br />&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;Do&nbsp;whatever&nbsp;you&nbsp;want<br />&nbsp;&nbsp;&nbsp;</span><span style="color: #007700">echo&nbsp;</span><span style="color: #DD0000">"."</span><span style="color: #007700">;<br /><br />&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;Continue&nbsp;downloading...<br />&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$ret&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">ftp_nb_continue</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn_id</span><span style="color: #007700">);<br />}<br />if&nbsp;(</span><span style="color: #0000BB">$ret&nbsp;</span><span style="color: #007700">!=&nbsp;</span><span style="color: #0000BB">FTP_FINISHED</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"There&nbsp;was&nbsp;an&nbsp;error&nbsp;downloading&nbsp;the&nbsp;file..."</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;exit(</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">//&nbsp;close&nbsp;filepointer<br /></span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>

 <div class="refsect1 seealso" id="refsect1-function.ftp-nb-fget-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.ftp-nb-get.html" class="function" rel="rdfs-seeAlso">ftp_nb_get()</a> - 从 FTP 服务器上获取文件并写入本地文件（non-blocking）</span></li>
    <li class="member"><span class="function"><a href="function.ftp-nb-continue.html" class="function" rel="rdfs-seeAlso">ftp_nb_continue()</a> - 连续获取／发送文件（non-blocking）</span></li>
    <li class="member"><span class="function"><a href="function.ftp-fget.html" class="function" rel="rdfs-seeAlso">ftp_fget()</a> - 从 FTP 服务器上下载一个文件并保存到本地一个已经打开的文件中</span></li>
    <li class="member"><span class="function"><a href="function.ftp-get.html" class="function" rel="rdfs-seeAlso">ftp_get()</a> - 从 FTP 服务器上下载一个文件</span></li>
   </ul>
  </p>
 </div>

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